Can't keep up

I haven't posted anything on Cixous, Plath, Under The Skin, and I've got tonnes to say, and upcoming is Kafka--suffice to say I'm getting pretty stressed out. All my own undoing, notwithstanding. Sigh.

My body feels claustrophobic everytime I think about how much I want to say, afraid it'll end up in verbal diarhorrea. My mind feels all murky and jumbled up--like too much seaweed and the tide's going down.

I wonder why there's this relation (almost a direct one at that, I think) between what I think and what I feel bodily. Like if I'm stressed as mentioned, I'd feel nauseous.

Why??? Are there theories on that? Is it just purely scientific and biological, or are there other non-material reasons?